Chelsea are stacked to the eyeballs with forward players.
Realistically you'd be thinking Madrid, City, PSG, Liverpool. But all depends on the financial situation next year.
If it is true that we have agreed terms with Sancho already then why not take Dembele on loan for a season and then go back in for him next summer? We should be in a better position financially (Covid permitting) and he'd have a year less on his contract. We may have more competition but surely we'd be ahead of the pack to sign him. Alternatively the Dembele loan works out and we're in a win-win situation.